Answered: Expected result 7 True 25391 True…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Whenever they zig, you gotta zag
def is_zigzag(n):

A positive integer n is called a zigzag number (also called an “alternating number” in some combinatorics material) if the series of differences between its consecutive digits strictly alternates between positive and negative steps. The step from the first digit to the second may be either positive or negative. The function should determine whether n is a zigzag number.

In the negative examples in the table below, the part of the number that violates the zigzag property is highlighted in red.

Expected result
n
7
True
25391
True
90817263545463728185
True
16329
False
104175101096715
False
49573912009
False

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